I'm working on the design of a new website, and I want to use some sort of subtle image for the background. I found this background on a website:
It's hard to see, but there's a very subtle image in the background.
I'm looking to make an image in a similar style, mostly an outline with thick strokes for the image edges. Something very simple like that. However, I'm not exactly sure how to go about doing that, or what software to use. Any suggestions?